<template>
  <div class="todo-header">
    <input type="text" placeholder="请输入你的任务名称，按回车键确认" v-model="content" @keyup.enter="add"/>
  </div>
</template>

<script>
import {nanoid} from 'nanoid';
export default {
  name: 'MyHeader',
  props: ['addTodo'],
  data() {
    return {
      content: ''
    }
  },
  methods: {
    add() {
      // 校验数据
      if (!this.content.trim()) {
        return alert('输入不能为空');
      }
      // 将用户的输入封装成一个todo对象
      const todoObj = {id:nanoid(), content: this.content, done: false};
      // 通知App组件去添加一个todo对象
      this.addTodo(todoObj);
      // 清空输入框
      this.content = '';
    }
  }
}
</script>


<style scoped>
/*header*/
.todo-header input {
  width: 560px;
  height: 28px;
  font-size: 14px;
  border: 1px solid #ccc;
  border-radius: 4px;
  padding: 4px 7px;
}

.todo-header input:focus {
  outline: none;
  border-color: rgba(82, 168, 236, 0.8);
  box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075), 0 0 8px rgba(82, 168, 236, 0.6);
}
</style>
